Chip-breaker-lift device.



H. J. MITCHELL.

CHIP BREAKER LIFT- DEVICE.

APPLICATION FILED 0m. 6. 1915.

1,188,809. Patented June 27,1916.

2 SHEETS-SHEET 1.

H. I. MITCHELL.

CHIP BREAKER LII-"T DEVICE.

APPLICATION man ocr. 6. ms.

Patented June 27,1916.

2 SHEETS-SHEIT 2.

fl-ll WLUIBIA PLANOGRAPII 00-. WASIIINC'ION. n. c.

UNITED STATES PATENT OFFICE.

HARRISON J. MITCHELL, 0F BELOIT, WISCONSIN, ASSIGNOR TO P. B. YATES MACHINE COMPANY, OF BELOIT, WISCONSIN, A CORPORATION OF WISCONSIN.

CHIP-BREAKER-LIFT DEVICE.

Application filed October 6, 1915.

To all whom it may concern:

Be it known that I, HARRISON J. MiTCH- ELL, a citizen of the United States, residing at Beloit, in the county of Rock and State of lVisconsin, have invented certain new and useful Improvements in Chip-Breaker-Lift Devices, of which the following is a specification.

In wood planers, it is desirable to locate the chipbreakers or hold-down appliances for the work well under the cylinder carrying the planer knives to bring such devices fairly close to the point of action of the knives. Under these circumstances, it is necessary when the chipbreakers are lifted to move them at the same time away from the cylinder knives to escape contact therewith.

Stated somewhat differently, the chipbreaker mountings are ordinarily such that when the breakers lift they move in a general direction the opposite of that of the lumber feed. The raising of the chipbreaker by the incoming board is, therefore, opposed by this necessary or desirable retrograde movement of the breaker, and the board is unable to actuate the breaker with that ease and facility desirable.

The main purpose of the present invention is to provide such chipbreakers or holddown pressure members with lifting devices which, during their elevating function, move in the same general direction of travel as that of the advancing board by which they are actuated, in this way enabling the board to operate or lift the chipbreaker more readily and eliminate or reduce the shock sometimes incident to the operation of appliances of this character unequipped With lifting devices, and, particularly when the feed of lumber is rapid.

In the accompanying drawings a desirable embodiment of the invention has been illustrated, its construction and method of operation being described below. In these drawings like reference characters refer to the same parts throughout the various views.

In the drawings: Figure 1 illustrates in vertical section the construction of chipbreaker and lifting appliance; Fig. 2 is a similar fragmentary View showing the manner in which the incoming board raises the chipbreaker by engaging the lifting device;

Specification of Letters Patent.

Patented June 27, 1916.

Serial No. 54,317.

and Fig. 3 is a plan view of the structure shown in Fig. 1.

Referring to the drawings, it will be observed that the planer is of the usual and ordinary construction, having a bed 10 and a vertically-adjustable yoke 11 in which the cylinder 12 carrying the planer-knives 13 is mounted. This yoke has the usual bearings 14 and 15 for the cylinder shaft and the outstanding lugs 16, 17, and 18 supporting the short shafts or rods 15) and 20 on which two side-bars or arms 21 and 22 are rock ingly mounted, the ends of such bars being cross-connected together by a rod 23. By means of screws 24 and 25 a chipbreaker housing 26 is fastened to the bars 21 and 22, the main body of such housing being of hollow triangular form, as shown in Fig. 1, the ends of the housing having apertured ears 2? with which the securing bolts 24 and 25 cooperate. This housing has a plurality of upstanding ears 28, 28, apertured in alinement for the accommodation of a rod or shaft 29 and between these cars on such rod a plurality of levers 30 are fulcrumed. Each of such levers has one end extended into, and by means of a pin 31 pivoted to, the upper bifurcated portions 32 of a chipbreaker or holddown appliance 33, which has a curved board-engaging toe 34 extending beneath the cylinder 12, and an upwardly-extended web shield 35. In order to yieldingly press these chipbreakers or holddown devices downwardly against the Work an end of each lever 30 is equipped with a pair of spaced ears 36 to which is pivoted by a pin 37 the upper end of a threaded pressure-rod 38, the lower end of which projects through an aperture 39 in an outstanding ledge or shelf 40 constituting part of the casting or housing 26. It should be understood that the single rib 40 is provided with a number of such perforations corresponding to the number of chipbreakers employed. On each of these rods 28 a coil expansion spring 41 is used which, at its lower end, bears against the top face of ledge 40, its upper end pressing against nut 42 on rod 38 backed up by a lock-nut 43. Obviously, the upward pressure of each of these springs tends to rock its lever 30 in such direction as to press downwardly its associated chipbreaker or hold-down shoe. In order to limit the descent of the breaker or shoe each lever is provided with an adjustable stop-screw all, the lower end of which is adapted to cooperate with the top face of the housing 26.

The bottom portion of housing 26 has integral therewith a plurality of depending ears l5 apertured in alinement for the reception of a rod or shaft 4L6. Each of the chipbreakers has pivoted thereto at 47 and also pivoted on the rod 46 a link 48 supplied with a depending lifting-toe 49, the lower edge 50 of which is curved or beveled downardly in the direction of the planing cylinder.

From an understanding of this construction it will be clear that when the toe if) is raised by the advancing board, it will move in a same general direction as the feed of such incoming board, that is, toward the left as the device is viewed in Figs. 1 and 2. The lifting action, however, of this device, causes a somewhat backward movement of the chipbreaker, but such actuation of the breaker does not conflict with the board, because the lifting is accomplished substantially entirely by means of the too 41 9. This toe, however, extends downwardly an amount slightly less than the chipbreaker, as shown in Figs. 1 and 2.

-While in this specification a single embodiment only of the invention has been presented, to those skilled in the art it will be apparent that the invention is susceptible of a considerable variety of embodiments, and that many minor mechanical changes within the scope of the appended claims may be made in the appliance illustrated and described Without departure from the substance of the invention.

I claim:

1. In an appliance of the character described, the combination of a chipbreaker, a mounting therefor permitting a lifting movement of the chipbreaker in a general direction opposed to the lumber feed, and a link pivoted to a standard and to the chipbreaker and carrying a lifting arm adapted to be engaged by the advancing piece of lumber, said arm moving in the general direction of lumber feed during its lifting action on the chipbreaker, substantially as described.

2. In an appliance of the character described, the combination of a chipbreaker, a mounting therefor permitting the breaker to be lifted, a support, and a link pivoted to the breaker and to said support, said link carrying a lifting arm between the pivots of the link and adapted to be engaged by the advancing piece of lumber and move in the same general. direction as the lumber dursubstantially as described.

HARRISON J. MITCHELL.

copiel of this patent may be obtained for five cents each, by addressing the Commissioner of latent. Washington, D. 0. 

